Searched hist:"7 e20269647169e7ea08a62bdc4979a3ba32e615c" (Results 1 – 3 of 3) sorted by relevance
| /openbmc/linux/arch/arm/kernel/ |
| H A D | entry-header.S | diff 7e20269647169e7ea08a62bdc4979a3ba32e615c Sun Nov 28 08:57:24 CST 2010 Will Deacon <will.deacon@arm.com> ARM: hw_breakpoint: disable preemption during debug exception handling
On ARM, debug exceptions occur in the form of data or prefetch aborts.
One difference is that debug exceptions require access to per-cpu banked
registers and data structures which are not saved in the low-level exception
code. For kernels built with CONFIG_PREEMPT, there is an unlikely scenario
that the debug handler ends up running on a different CPU from the one
that originally signalled the event, resulting in random data being read
from the wrong registers.
This patch adds a debug_entry macro to the low-level exception handling
code which checks whether the taken exception is a debug exception. If
it is, the preempt count for the faulting process is incremented. After
the debug handler has finished, the count is decremented.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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| H A D | hw_breakpoint.c | diff 7e20269647169e7ea08a62bdc4979a3ba32e615c Sun Nov 28 08:57:24 CST 2010 Will Deacon <will.deacon@arm.com> ARM: hw_breakpoint: disable preemption during debug exception handling
On ARM, debug exceptions occur in the form of data or prefetch aborts.
One difference is that debug exceptions require access to per-cpu banked
registers and data structures which are not saved in the low-level exception
code. For kernels built with CONFIG_PREEMPT, there is an unlikely scenario
that the debug handler ends up running on a different CPU from the one
that originally signalled the event, resulting in random data being read
from the wrong registers.
This patch adds a debug_entry macro to the low-level exception handling
code which checks whether the taken exception is a debug exception. If
it is, the preempt count for the faulting process is incremented. After
the debug handler has finished, the count is decremented.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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| H A D | entry-armv.S | diff 7e20269647169e7ea08a62bdc4979a3ba32e615c Sun Nov 28 08:57:24 CST 2010 Will Deacon <will.deacon@arm.com> ARM: hw_breakpoint: disable preemption during debug exception handling
On ARM, debug exceptions occur in the form of data or prefetch aborts.
One difference is that debug exceptions require access to per-cpu banked
registers and data structures which are not saved in the low-level exception
code. For kernels built with CONFIG_PREEMPT, there is an unlikely scenario
that the debug handler ends up running on a different CPU from the one
that originally signalled the event, resulting in random data being read
from the wrong registers.
This patch adds a debug_entry macro to the low-level exception handling
code which checks whether the taken exception is a debug exception. If
it is, the preempt count for the faulting process is incremented. After
the debug handler has finished, the count is decremented.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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